Modelo computacional avançado para análise de estruturas sob ação de gradientes térmicos

• Autor(a) principal: Neves, Natan Sian das
• Data de Publicação: 2019
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Repositório Institucional da Universidade Federal do Espírito Santo (riUfes)
• Texto Completo: http://repositorio.ufes.br/handle/10/13862
• topic: Elementos finitos; Modelo computacional; Análise termoestrutural; Finite elements; Computational model; Thermo-structural analysis; Thermal effects; Fire; subject.br-rjbn; Engenharia Civil

Structural modeling of thermal effects has important practical applications in engineering, corroborating the continuing interest of academic scientific research in the field. In particular, since structural elements are subjected to high temperatures, the properties of the materials used in the structures deteriorate with increasing temperature, resulting in a considerable loss of strength and stiffness. Under these conditions, the structures present complex behaviors associated to nonlinear mathematical models, requiring advanced calculus analysis. Thus, current research aims to study the performance of structures under fire action. To this end, a computational model called NASEN (Numerical Analysis Software for Engineering) was developed, containing specific modules for physical engineering areas. For the characteristics of the research, highlight, firstly, the module for thermal analysis in structures, where the nonlinear transient two-dimensional heat conduction is studied. Then, the module for thermo-structural analysis is based on the solution of a coupling of sequential numerical processes, that is, the temperature field at the cross-sectional level is first determined and, subsequently, the mechanical response is obtained based the fiber model and nonlinear structural procedures. The numerical experiments carried out during the research transited about problems of thermal and structural nature, associated to the linear and nonlinear behaviors, well were tested different geometries, boundary conditions and types of materials. The numerical experiments carried out during the research transited about problems of thermal and structural nature, associated to the linear and nonlinear behaviors, where were tested different geometries, boundary conditions and types of materials. In general, the results obtained with the computer simulations led to satisfactory responses when compared to the experimental measurements, numerical or analytical solutions available in the literature.